I need a little more information: was this baby growing well before introduction of cereal in the diet. When were the cereals introduced? I a child this age who suddenly quits growing, it is very important to get a detailed diet history and if the change in growth pattern relates in time to introduction of cereals I would be very concerned about celiac disease ("allergy" to gluten which causes gut damage and poor growth. May or may not have diarrhea associated with gut damage). Maryelle